I have 1992 B4C. Recently I have noticed that it doesn't want to accelerate smoothly under light throttle, especially during initial tip-in. It does this right off idle, and even when going at 70mph or so, if I let off of the gas a little then ease back on. Other than that, no problems. I'm not sure if this could be TPS related, or possibly, and I know this is a stretch, bad u-joints? It almost seems that the driveshaft might be snapping trying to catch up with the trans or the wheels. Any thoughts?

 

rev the motor and see how long it takes to fall down and test another car if it falls too slowly then your tps is bad

 

I don't see how that is related to my question. When you let off the gas doesn't the throttle close, so the rate at which the engine revs down is not dependant on the TPS anymore, but has more to do with the IAC.

 

i was just giving you a away to test your tps and see if it needed adjustment or if it was bad.

 

The best way to check a TPS is to disconnect the harness from it and hook an old analog ohm meter to it and slowly move it through its range while watching the ohm meter. If the needle mooves smoothly while moving the TPS lever and doesn't stop or falter, then the TPS has no dead spots in it and if it can be adjusted to the .54 volts on the car, then it is good.

 

how can It be adjusted?

 

If you think its the U-joints just get under the car with the rear wheels off the ground and the tranny in park. Just try and turn the tires and watch the u-joints for play. Simple check really. So is the TPS. Just use the meter to test the TPS like morley said. hope you get it worked out.
greg